NAME

uname - return system name

SYNOPSIS

uname [snrvma]

DESCRIPTION

By default, the
uname
utility will write the operating system name to standard output.
When options are specified, symbols
representing one or more system characteristics will be
written to the standard output.
The format and contents of the symbols are implementation-dependent.
On systems conforming to the XSH specification, the symbols
written will be those supported by the XSH specification
uname()
function.

OPTIONS

Write the name of the hardware type on which the
system is running to standard output.

-n

Write the name of this node within
an implementation-dependent communications network.

-r

Write the current
release level of the operating system implementation.

-s

Write the name of the
implementation of the operating system.

-v

Write the current version
level of this release of the operating system implementation.

If no options are specified, the
uname
utility will write the operating system name, as if the
-s
option had been specified.

OPERANDS

None.

STDIN

Not used.

INPUT FILES

None.

ENVIRONMENT VARIABLES

The following environment variables affect the execution of
uname:

LANG

Provide a default value for the internationalisation variables
that are unset or null.
If
LANG
is unset or null, the corresponding value from the
implementation-dependent default locale will be used.
If any of the internationalisation variables contains an invalid setting, the
utility will behave as if none of the variables had been defined.

LC_ALL

If set to a non-empty string value,
override the values of all the other internationalisation variables.

LC_CTYPE

Determine the
locale for the interpretation of sequences of bytes of text data as
characters (for example, single- as opposed to multi-byte characters
in arguments).

LC_MESSAGES

Determine the locale that should be used to affect
the format and contents of diagnostic
messages written to standard error.

NLSPATH

Determine the location of message catalogues
for the processing of
LC_MESSAGES .

ASYNCHRONOUS EVENTS

Default.

STDOUT

By default, the output will be a single line of the following form:

"%s\n", <sysname>

If the
-a
option is specified,
the output will be a single line of the following form:

Additional implementation-dependent symbols may be written;
all such symbols will be written at
the end of the line of output before the
newline character.

If options are specified to select
different combinations of the symbols,
only those symbols will be written,
in the order shown above for the
-a
option.
If a symbol is not selected for writing, its corresponding trailing
blank characters
also will not be written.

STDERR

Used only for diagnostic messages.

OUTPUT FILES

None.

EXTENDED DESCRIPTION

None.

EXIT STATUS

The following exit values are returned:

0

The requested information was successfully written.

>0

An error occurred.

CONSEQUENCES OF ERRORS

Default.

APPLICATION USAGE

Note that any of the symbols could include embedded
space characters,
which may affect parsing algorithms
if multiple options are selected for output.

The node name is typically a name that the system uses
to identify itself for intersystem communication addressing.

EXAMPLES

The following command:

uname -sr

writes the operating system name and release level, separated by one
or more
blank characters.